CN109093098A - A kind of magnesium alloy complexity enclosed type core method for exhausting - Google Patents

A kind of magnesium alloy complexity enclosed type core method for exhausting Download PDF

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Publication number
CN109093098A
CN109093098A CN201811066364.4A CN201811066364A CN109093098A CN 109093098 A CN109093098 A CN 109093098A CN 201811066364 A CN201811066364 A CN 201811066364A CN 109093098 A CN109093098 A CN 109093098A
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China
Prior art keywords
sand
exhaust
core
mold
type
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CN201811066364.4A
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Chinese (zh)
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CN109093098B (en
Inventor
牛德良
刘洪汇
韩永华
张永
张守伟
宋永雷
隋联亭
梁镇强
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AECC Harbin Dongan Engine Co Ltd
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AECC Harbin Dongan Engine Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00Pressure casting; Vacuum casting
    • B22D18/04Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C1/00Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/20Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
    • B22C1/22Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/02Sand moulds or like moulds for shaped castings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/10Cores; Manufacture or installation of cores
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/12Treating moulds or cores, e.g. drying, hardening

Abstract

The present invention relates to a kind of magnesium alloy complexity enclosed type core method for exhausting, pass through the exhaust systems such as design air storing cavity, exhaust pipe, exhaust duct, exhaust rope, in casting process, aluminium alloy chamber air, outside exhaust rope to type chamber, the heated baking of sand core generates oxidizing gas, is discharged to outside type chamber through exhaust duct;With exhaust pipe sand core, gas enters pipeline by tube wall said minuscule hole and is discharged to outside type chamber through exhaust duct.The present invention is using optimization molding sand, core sand material mixture ratio and adds the method that proprietary exhaust passage combines, sand mold, sand-core exhaust capacity are improved, gas hole defect, dreg defect and the combustion problem that structure is complicated, the closed large-scale Mg alloy castings in inner cavity generate in low pressure casting process are effectively solved.

Description

A kind of magnesium alloy complexity enclosed type core method for exhausting
Technical field
The present invention relates to a kind of method for exhausting, especially a kind of magnesium alloy complexity enclosed type core method for exhausting.
Background technique
Structure is complicated, in the closed large-scale Mg alloy castings low pressure casting process in inner cavity, sand mold when filling type, sand core and high The interaction of temperature alloy liquid phase can generate a large amount of oxidizing gas, these oxidizing gas and the original air of type chamber, by sand mold, sand The gas permeability of core itself, can not thoroughly exclude sand mold in time, and residual gas will be with filling type and swimming everywhere for liquid magnesium alloy It walks, ultimately forms stomata or react with aluminium alloy to form oxide slag inclusion and be randomly deposited in cast-internal, lead to casting metallurgy matter Measure it is unqualified, such as oxidation reflection will acutely occur burning cause casting fail.
Summary of the invention
The purpose of the present invention is finding a kind of method for exhausting, it can solve that structure is complicated, the closed large-scale magnesium alloy in inner cavity Casting low pressure casting exhausting problem.
Particular technique method of the invention is that a kind of magnesium alloy complexity enclosed type core method for exhausting includes following step It is rapid:
(1) it is required according to product drawing, designs foundary methods drawing, poured weights 200kg or more or sand core quantity are at 15 The above casting needs to arrange that dedicated exhaust system, dedicated exhaust system include following several exhaust modes:
A. air storing cavity: in the sand core internal setting cavity of similar square of the volume greater than 100mm × 100mm, core knocks thickness 20~3mm, to guarantee sand core strength;
B. exhaust pipe: exhaust pipe is made of the copper pipe or steel pipe of Φ 4~Φ 40mm wall thickness 2mm, and tube wall is distributed 1~Φ of Φ 2mm spacing 10~20mm minuscule hole when coremaking, is placed in cylindricality sand core core, and sand core is generated by high temperature alloy liquid package Gas is discharged after entering pipeline by tube wall minuscule hole;
C. it exhaust duct: is designed on sand mold by sand core internal cavity to external exhaust duct, and is provided with exhaust pipe or row Gas rope, exhaust pipe or exhaust rope will be exported to type chamber after gas collection;Meanwhile diameter is in the sand core of 6~8mm, centre system At the exhaust duct of Φ 2mm, using laser sintered mode coremaking, oil circuit core of the diameter less than 6mm is not provided with exhaust passage;
D. exhaust is restricted: being made, is placed on sand mold die joint of glass fibre, sand mold inner cavity is connected to outside;
(2) mold is manufactured by foundary methods drawing;
(3) molding and core making, sand mold, sand core using send general sand, send the weight ratio control of the resin in general sand 0.7%~ Between 1.0%, in which:
Moulding: general sand is sent in sandbox filling, away from all areas other than 50~80mm of type chamber, with Φ 5~Φ 8mm steel wire system At exhaust needle prick gas vent, be vented 100~200mm of pitch of holes, general sand then sent to solidify, lift goes out type;
Coremaking: according to exhaust system scheme setting air storing cavity, exhaust pipe, exhaust duct or the exhaust being pre-designed in core box Rope after back-up sand, wait send general sand to solidify, is opened coring;
(4) sand mold, sand core are risen again
A. it sends the sand mold of general sand, sand core to be risen again requirement: after 180 ± 10 DEG C of heat preservation 2h ± 10min, being warming up to 210 ± 10 DEG C; Soaking time 6h ± 10min, after 210 ± 10 DEG C of heat preservation 2h ± 10min blow 2h ± 10min, end of rising again rise again kiln power-off, It opens wicket and places kiln discharge after 2~3h in kiln, start a group type after 2~3h of temperature of drying in the air;
B. laser sintered sand core is risen again requirement: 150 ± 10 DEG C of tempering temperature, soaking time 4h+10min, heat preservation 1h ± After 10min, blow 2h ± 10min, and after the completion of rising again, half-open fire door, which dries in the air, starts a group core after 2~3h of temperature;
(5) group type, group core, assemble according to sand mold, sand core sequencing in foundary methods drawing, one by one according to exhaust system side Case places exhaust rope on specific die joint, it is ensured that the air storing cavity between sand mould, exhaust pipe, exhaust duct, exhaust rope mutually interconnect Logical, the gas for realizing that casting process type chamber and type core generate can smoothly exclude casting mold;
(6) it is poured after group type, cooling, desanding is examined.
The present invention is by design exhaust system, and the exhaust system is according to the concrete condition of pouring product, including gas storage Chamber, exhaust pipe, exhaust duct, exhaust rope etc., in casting process, aluminium alloy inflow type chamber rapidly, there are two parts for type chamber at this time Gas, a part are chamber air, outside exhaust rope to type chamber.Another part is that the heated baking of sand core generates oxidisability Gas has air storing cavity sand core, by exhaust pipe after gas collection to air storing cavity, is discharged to outside type chamber through exhaust duct;With exhaust Pipe sand core, gas enters pipeline by tube wall said minuscule hole and is discharged to outside type chamber through exhaust duct, to realize magnesium alloy pouring process Smoothly exhaust.The present invention relates to the method for exhausting of large-scale Mg alloy castings low pressure casting, using optimization molding sand, core sand material mixture ratio With the method adding proprietary exhaust passage and combining, sand mold, sand-core exhaust capacity are improved, effectively solves that structure is complicated, inner cavity envelope Gas hole defect, dreg defect and the combustion problem that the large-scale Mg alloy castings closed generate in low pressure casting process.
Detailed description of the invention
Fig. 1 is the schematic diagram of several exhaust modes of the present invention.
Specific embodiment
As shown, a kind of magnesium alloy complexity enclosed type core method for exhausting the following steps are included:
1) required according to product drawing, design foundary methods drawing, poured weights 200kg or more or sand core quantity 15 with Upper casting needs to arrange that dedicated exhaust system, dedicated exhaust system include following several exhaust modes:
A air storing cavity 1: cavity is set in the sand core internal of similar square of the volume greater than 100mm × 100mm, core knocks thickness 20~3mm, to guarantee sand core strength;
B exhaust pipe 2: exhaust pipe is made of the copper pipe or steel pipe of Φ 4~Φ 40mm wall thickness 2mm, and tube wall is distributed 1~Φ of Φ 2mm spacing 10~20mm minuscule hole when coremaking, is placed in cylindricality sand core core, and sand core is generated by high temperature alloy liquid package Gas is discharged after entering pipeline by tube wall minuscule hole;
C exhaust duct 3: it is designed on sand mold by sand core internal cavity to external exhaust duct, and is provided with exhaust pipe or row Gas rope, exhaust pipe or exhaust rope will be exported to type chamber after gas collection;Meanwhile diameter is in the sand core of 6~8mm, centre system At the exhaust duct of Φ 2mm, using laser sintered mode coremaking, oil circuit core of the diameter less than 6mm is not provided with exhaust passage;
D exhaust rope 4: being made of glass fibre, be placed on sand mold die joint 6, and sand mold inner cavity is connected to outside;
2) mold is manufactured by foundary methods drawing;
3) molding and core making, sand mold 7, sand core 8 send the weight ratio of the resin in general sand to control 0.7% using general sand is sent Between~1.0%, in which:
Moulding: general sand is sent in sandbox filling, away from all areas other than 50~80mm of type chamber, with the exhaust of 5~Φ of Φ 8mm Needle pricks gas vent 5, is vented 100~200mm of pitch of holes, and general sand is then sent to solidify, and lift goes out type;
Coremaking: according to exhaust system scheme setting air storing cavity 1, exhaust pipe 2, exhaust duct 3 or the row being pre-designed in core box Gas rope 4 after back-up sand, wait send general sand to solidify, is opened coring;
4) sand mold, sand core are risen again
A sends the sand mold 7 of general sand, sand core 8 to be risen again requirement: after 180 ± 10 DEG C of heat preservation 2h ± 10min, being warming up to 210 ± 10 ℃;Soaking time 6h ± 10min, blow 2h ± 10min after 210 ± 10 DEG C of heat preservation 2h ± 10min, and end of rising again kiln of rising again is disconnected Electricity opens wicket and places kiln discharge after 2~3h in kiln, starts a group type after 2~3h of temperature of drying in the air;
The laser sintered sand core 8 of b is risen again requirement: 150 ± 10 DEG C of tempering temperature, soaking time 4h+10min, heat preservation 1h ± After 10min, blow 2h ± 10min, and after the completion of rising again, half-open fire door, which dries in the air, starts a group core after 2~3h of temperature;
5) group type, group core, assemble according to sand mold 7,8 sequencing of sand core in foundary methods drawing, one by one according to exhaust system Scheme places exhaust rope 4 on specific die joint, it is ensured that the air storing cavity 1 between 7 core of sand mold sand, exhaust pipe 2, exhaust duct 3, exhaust rope 4 are interconnected, and the gas for realizing that casting process type chamber and type core generate can smoothly exclude casting mold;
6) it is poured after group type, cooling, desanding is examined.

Claims (1)

1. a kind of magnesium alloy complexity enclosed type core method for exhausting, which is characterized in that the method the following steps are included:
1) it is required according to product drawing, designs foundary methods drawing, poured weights 200kg or more or sand core quantity are cast at 15 or more Part needs to arrange that dedicated exhaust system, dedicated exhaust system include following several exhaust modes:
A. air storing cavity (1): in the sand core internal setting cavity of similar square of the volume greater than 100mm × 100mm, core knocks thickness 20 ~3mm, to guarantee sand core strength;
B. exhaust pipe (2): exhaust pipe is made of the copper pipe or steel pipe of Φ 4~Φ 40mm wall thickness 2mm, and tube wall is distributed 1~Φ of Φ 2mm Spacing 10~20mm minuscule hole when coremaking, is placed, the gas that sand core is generated by high temperature alloy liquid package in cylindricality sand core core It is discharged after entering pipeline by tube wall minuscule hole;
C. it exhaust duct (3): is designed on sand mold by sand core internal cavity to external exhaust duct, and is provided with exhaust pipe or exhaust Rope, exhaust pipe or exhaust rope will be exported to type chamber after gas collection;Meanwhile diameter, in the sand core of 6~8mm, centre is made The exhaust duct of Φ 2mm, using laser sintered mode coremaking, oil circuit core of the diameter less than 6mm is not provided with exhaust passage;
D. exhaust is restricted (4): being made, is placed on sand mold die joint (6) of glass fibre, sand mold inner cavity is connected to outside;
2) mold is manufactured by foundary methods drawing;
3) molding and core making, sand mold (7), sand core (8) send the weight ratio of the resin in general sand to control 0.7% using general sand is sent Between~1.0%, in which:
Moulding: general sand is sent in sandbox filling, away from all areas other than 50~80mm of type chamber, is pricked with the exhaust needle of 5~Φ of Φ 8mm Then gas vent (5), gas vent (5) 100~200mm of spacing send general sand to solidify, lift goes out type;
Coremaking: in core box according to be pre-designed exhaust system scheme setting air storing cavity (1), exhaust pipe (2), exhaust duct (3) or Exhaust rope (4) after back-up sand, wait send general sand to solidify, is opened coring;
4) sand mold, sand core are risen again
A. it sends the sand mold (7) of general sand, sand core (8) to be risen again requirement: after 180 ± 10 DEG C of heat preservation 2h ± 10min, being warming up to 210 ± 10 ℃;Soaking time 6h ± 10min, blow 2h ± 10min after 210 ± 10 DEG C of heat preservation 2h ± 10min, and end of rising again kiln of rising again is disconnected Electricity opens wicket and places kiln discharge after 2~3h in kiln, starts a group type after 2~3h of temperature of drying in the air;
B. laser sintered sand core (8) is risen again requirement: 150 ± 10 DEG C of tempering temperature, soaking time 4h+10min, heat preservation 1h ± After 10min, blow 2h ± 10min, and after the completion of rising again, half-open fire door, which dries in the air, starts a group core after 2~3h of temperature;
5) group type, group core, assemble according to sand mold in foundary methods drawing (7), sand core (8) sequencing, one by one according to exhaust system Scheme places exhaust rope 4 on specific die joint, it is ensured that the air storing cavity (1) between 7 core of sand mold sand, exhaust pipe (2), and exhaust duct (3), Exhaust rope (4) is interconnected, and the gas for realizing that casting process type chamber and type core generate can smoothly exclude casting mold;
6) it is poured after group type, cooling, desanding is examined.
CN201811066364.4A 2018-09-12 2018-09-12 Exhaust method for magnesium alloy complex closed core Active CN109093098B (en)

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Application Number Priority Date Filing Date Title
CN201811066364.4A CN109093098B (en) 2018-09-12 2018-09-12 Exhaust method for magnesium alloy complex closed core

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Application Number Priority Date Filing Date Title
CN201811066364.4A CN109093098B (en) 2018-09-12 2018-09-12 Exhaust method for magnesium alloy complex closed core

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110421121A (en) * 2019-08-29 2019-11-08 贵州安吉航空精密铸造有限责任公司 A kind of vent control valve tube core manufacturing method in casting technique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5719125A (en) * 1980-07-08 1982-02-01 Taiyo Chuki Kk Method and apparatus of manufacturing of thin-walled casting mold
CN102335723A (en) * 2011-10-31 2012-02-01 王卫民 Negative pressure casting molding method for thin-wall structure
CN106341997B (en) * 2008-01-07 2012-02-22 哈尔滨东安发动机(集团)有限公司 The anti-burning method of large-scale magnesium alloy cast
CN202824536U (en) * 2012-11-09 2013-03-27 济南方德利模具有限公司 Improved core
CN104550768A (en) * 2013-10-25 2015-04-29 青岛和德隆机械有限公司 Magnesium alloy intake manifold metal type tilted casting technology

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5719125A (en) * 1980-07-08 1982-02-01 Taiyo Chuki Kk Method and apparatus of manufacturing of thin-walled casting mold
CN106341997B (en) * 2008-01-07 2012-02-22 哈尔滨东安发动机(集团)有限公司 The anti-burning method of large-scale magnesium alloy cast
CN102335723A (en) * 2011-10-31 2012-02-01 王卫民 Negative pressure casting molding method for thin-wall structure
CN202824536U (en) * 2012-11-09 2013-03-27 济南方德利模具有限公司 Improved core
CN104550768A (en) * 2013-10-25 2015-04-29 青岛和德隆机械有限公司 Magnesium alloy intake manifold metal type tilted casting technology

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110421121A (en) * 2019-08-29 2019-11-08 贵州安吉航空精密铸造有限责任公司 A kind of vent control valve tube core manufacturing method in casting technique

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